[Daryl]

If the right shoulder moves down plane then the left shoulder must move up so the shoulders do not always go back and through? They must at some time just move down and up?

Good point Jerry.

If the Head is Stationary, then the Shoulders move around it. It may not be so much a question of how fast they move, but rather how Far they move.

To sustain the Lag, all of the Pivot components must keep moving at least through the Impact Interval. No quitting.